This extension is leveraged by micro:bit CreateAI which creates suitable blocks based on the machine learning model you build in the app. It is not useful separate from micro:bit CreateAI.
Ensure you have the required toolchain to build for V1 and V2 (arm-none-eabi-gcc, python, yotta, cmake, ninja, srec_cat) or docker.
git clone https://github.com/microbit-foundation/pxt-microbit-ml
cd pxt-microbit-ml
npm install pxt --no-save
npx pxt target microbit --no-save
npx pxt install
PXT_FORCE_LOCAL=1 PXT_NODOCKER=1 npx pxt
For the V1 build Yotta can hit the GitHub rate limits quite easily if the
project is built from a clean state more than once.
A V2-only build can be performed with the PXT_COMPILE_SWITCHES=csv---mbcodal
environmental variable.
PXT_FORCE_LOCAL=1 PXT_NODOCKER=1 PXT_COMPILE_SWITCHES=csv---mbcodal npx pxt
By default the model will run every 250 ms, to change this value the
ML_INFERENCE_PERIOD_MS
config can be modified.
{
"yotta": {
"config": {
"ML_INFERENCE_PERIOD_MS": 250
}
}
}
By default this extension configures the Model prediction events to not be queued for the same event. So if an event raised when its handler is still running it will be dropped.
{
"yotta": {
"config": {
"ML_EVENT_LISTENER_DEFAULT_FLAGS": 32
}
}
}
The values are defined in the codal-core/inc/core/CodalListener.h file:
#define MESSAGE_BUS_LISTENER_REENTRANT 0x0008
#define MESSAGE_BUS_LISTENER_QUEUE_IF_BUSY 0x0010
#define MESSAGE_BUS_LISTENER_DROP_IF_BUSY 0x0020
#define MESSAGE_BUS_LISTENER_NONBLOCKING 0x0040
#define MESSAGE_BUS_LISTENER_URGENT 0x0080
The MLRUNNER_USE_EXAMPLE_MODEL
flag can be configured as described in:
https://github.com/microbit-foundation/pxt-microbit-ml-runner#built-in-ml-model
To enable debug print from this extension, add the following into your pxt.json file:
{
"yotta": {
"config": {
"ML_DEBUG_PRINT": 1
}
}
}
This software made available under the MIT open source license.
Trust, partnership, simplicity and passion are our core values we live and breathe in our daily work life and within our projects. Our open-source projects are no exception. We have an active community which spans the globe and we welcome and encourage participation and contributions to our projects by everyone. We work to foster a positive, open, inclusive and supportive environment and trust that our community respects the micro:bit code of conduct. Please see our code of conduct which outlines our expectations for all those that participate in our community and details on how to report any concerns and what would happen should breaches occur.
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